Sponsored Content
Special Forums UNIX Desktop Questions & Answers cygwin error device or resource busy Post 302353573 by Corona688 on Tuesday 15th of September 2009 04:41:28 PM
Old 09-15-2009
Remember, Cygwin is still subject to silly Windows limitations like two programs not being able to open one port. bash can't open a file for reading and writing simultaneously, so bash can't do it by itself. I'm trying to think of a common shell utility to do this or some way to trick bash into it but so far I'm coming up empty... There's things like minicom, but I'm guessing you want to automate something.

You could use putty if just typing in raw commands is what you want. It's what I use for raw serial port communication in UNIX, and there's a native Windows version with precisely the same functionality.

Or... It's entirely possible your phone doesn't have the control signals to tell it when the connection's broken, so that closing the device file doesn't lose anything. You might be able to
Code:
echo "AT" > /dev/ttyS0
cat /dev/ttyS0

if you set it up with stty correctly first. There's a setting in stty somewhere to define the amount of time to wait before closing the connection. Set it to zero(or just something small) and it gives you only what's in the buffer, which lets you just keep reopening and reclosing it whenever you want to read or write. I've used this feature in actual UNIX, but I don't know if Windows will do this properly -- it might just discard everything while the file's closed.

---------- Post updated at 02:41 PM ---------- Previous update was at 02:11 PM ----------

I finally figured it out, maybe. Try this:

Code:
# Open ttyS2 for reading and writing as FD 5
exec 5<>/dev/ttyS2
# Leave this running in the background
cat <&5 &
# Write a command to FD 5
echo "AT" >&5

Windows may still complain. I'm not sure.

Last edited by Corona688; 09-15-2009 at 05:19 PM..
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

umount, device busy, but..

I'm trying to unmount a file system, but umount says the device is busy. A fuser -c /myfs tells me that nothing on this fs is in use. Any idea? Oh, and btw, why isn't my signature beeing displayed? Show user's signature is enabled and I have entered one :/ (10 Replies)
Discussion started by: sTorm
10 Replies

2. HP-UX

Cannot umount - device busy

Anyone have any idea why I cannot umount a directory even though fuser shows no process attached to it? fuser -cu /data/oracle/GMPSHRDM/export /data/oracle/GMPSHRDM/export: umount /data/oracle/GMPSHRDM/export umount: cannot unmount /data/oracle/GMPSHRDM/export : Device busy umount:... (2 Replies)
Discussion started by: keelba
2 Replies

3. UNIX for Dummies Questions & Answers

Device or resource busy??

Hi, I'm trying to do a sharity mount to mount a terastation network drive. I'm getting a Device or resource busy message after my mount command. Please see output below... # /usr/local/sharity3/bin/sharity mount smb://labbackup01/bakup_data /mnt/labbackup01 Device or resource busy.... (2 Replies)
Discussion started by: orahi001
2 Replies

4. UNIX Desktop Questions & Answers

cygwin /dev/ttyS2: Device or resource busy

Ciao a tutti!!! il mio problema è questo: sto cercando di inviare dei comandi AT da PC a cellulare utilizzando il bluetooth e cygwin e vorrei visualizzare le risposte nella shell bash. Per farlo apro due terminali utilizzando le seguente istruzioni: xterm & Sul primo scrivo cat /dev/ttyS2 ... (0 Replies)
Discussion started by: blianna
0 Replies

5. UNIX and Linux Applications

/dev/ttyS2 device or resource busy

Ciao a tutti!!! il mio problema è questo: sto cercando di inviare dei comandi AT da PC a cellulare utilizzando il bluetooth e cygwin e vorrei visualizzare le risposte nella shell bash. Per farlo apro due terminali utilizzando le seguente istruzioni: xterm & Sul primo scrivo cat /dev/ttyS2 ... (1 Reply)
Discussion started by: blianna
1 Replies

6. Hardware

/dev/ttyS0: Device or resource busy

hello to everybody I have Ubuntu Lucid 10.04 installed on my Desktop and I have a PCI serial card in my computer and it has only one serial port. Actually I want to use this serial port for the serial communication and for that I executed this command : $ setserial -g /dev/ttyS and I... (0 Replies)
Discussion started by: piyush011
0 Replies

7. UNIX for Dummies Questions & Answers

UNIX rm -rf error "rm: cannot remove `filename' : Device or resource busy"

Hi Everyone, I am trying to remove a directory: $ rm -rf directory_name/ rm: cannot remove `directory_name/filename': Device or resource busy What does this mean, and why can't I remove these files? I already tried moving into the directory, and removing the files individually, but I... (7 Replies)
Discussion started by: Anna_Z
7 Replies

8. UNIX for Advanced & Expert Users

lvm swapon failed Device or resource busy

Is there a trick to mounting swap in n a lvm? I can't get it to work. # swapon -va swapon on /dev/mapper/VG-lv_swap swapon: /dev/mapper/VG-lv_swap: found swap signature: version 1, page-size 4, same byte order swapon: /dev/mapper/VG-lv_swap: pagesize=4096, swapsize=4294967296,... (1 Reply)
Discussion started by: cokedude
1 Replies

9. SCO

NFS umount shows the "Device busy (Error 16)"

Hi there After making a backup copy of it sometimes happens that when I want to unmount an NFS indicates the error:umount: /path_mount busy: Device busy (Error 16) if I run lsoff, I can not find the process that is blocking the application. I'm using OpenServer 5.0.2c as one NFS server ... (14 Replies)
Discussion started by: flako
14 Replies

10. HP-UX

Failed to open tape device /dev/rmt/0mn:Device busy (errno = 16)

Hi, Unable to make tape backup, please help. /opt/ignite/bin/make_tape_recovery -a /dev/rmt/?mn -I -v -m tar -x inc_entire=vg00 * Creating local directories for configuration files and archive. ======= 04/25/16 16:28:08 IST Started /opt/ignite/bin/make_tape_recovery. (Mon... (4 Replies)
Discussion started by: anuragr
4 Replies
plink(1)							 PuTTY tool suite							  plink(1)

NAME
plink - PuTTY link, command line network connection tool SYNOPSIS
plink [options] [user@]host [command] DESCRIPTION
plink is a network connection tool supporting several protocols. OPTIONS
The command-line options supported by plink are: -V Show version information and exit. -pgpfp Display the fingerprints of the PuTTY PGP Master Keys and exit, to aid in verifying new files released by the PuTTY team. -v Show verbose messages. -load session Load settings from saved session. -ssh Force use of SSH protocol (default). -telnet Force use of Telnet protocol. -rlogin Force use of rlogin protocol. -raw Force raw mode. -serial Force serial mode. -P port Connect to port port. -l user Set remote username to user. -m path Read remote command(s) from local file path. -batch Disable interactive prompts. -pw password Set remote password to password. CAUTION: this will likely make the password visible to other users of the local machine (via com- mands such as `w'). -L [srcaddr:]srcport:desthost:destport Set up a local port forwarding: listen on srcport (or srcaddr:srcport if specified), and forward any connections over the SSH con- nection to the destination address desthost:destport. Only works in SSH. -R [srcaddr:]srcport:desthost:destport Set up a remote port forwarding: ask the SSH server to listen on srcport (or srcaddr:srcport if specified), and to forward any con- nections back over the SSH connection where the client will pass them on to the destination address desthost:destport. Only works in SSH. -D [srcaddr:]srcport Set up dynamic port forwarding. The client listens on srcport (or srcaddr:srcport if specified), and implements a SOCKS server. So you can point SOCKS-aware applications at this port and they will automatically use the SSH connection to tunnel all their connec- tions. Only works in SSH. -X Enable X11 forwarding. -x Disable X11 forwarding (default). -A Enable agent forwarding. -a Disable agent forwarding (default). -t Enable pty allocation (default if a command is NOT specified). -T Disable pty allocation (default if a command is specified). -1 Force use of SSH protocol version 1. -2 Force use of SSH protocol version 2. -C Enable SSH compression. -i path Private key file for authentication. -s Remote command is SSH subsystem (SSH-2 only). -N Don't start a remote command or shell at all (SSH-2 only). -sercfg configuration-string Specify the configuration parameters for the serial port, in -serial mode. configuration-string should be a comma-separated list of configuration parameters as follows: o Any single digit from 5 to 9 sets the number of data bits. o `1', `1.5' or `2' sets the number of stop bits. o Any other numeric string is interpreted as a baud rate. o A single lower-case letter specifies the parity: `n' for none, `o' for odd, `e' for even, `m' for mark and `s' for space. o A single upper-case letter specifies the flow control: `N' for none, `X' for XON/XOFF, `R' for RTS/CTS and `D' for DSR/DTR. MORE INFORMATION
For more information on plink, it's probably best to go and look at the manual on the PuTTY web page: http://www.chiark.greenend.org.uk/~sgtatham/putty/ BUGS
This man page isn't terribly complete. See the above web link for better documentation. PuTTY tool suite 2004-03-24 plink(1)
All times are GMT -4. The time now is 05:56 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy